!!! Overview
[{$pagename}] ([ISBN]) is a numeric [Unique Identifier] for commercial [books] represented as an [EAN].

[{$pagename}] is assigned to each edition and variation (except reprintings) of a [book]. For example, an ebook, a paperback, and a hardcover edition of the same book would each have a different [{$pagename}]s.

[{$pagename}] is 13 [digits] long if assigned on or after 1 January [2007|Year 2007], and 10 digits long if assigned before [2007|Year 2007]. 

An [{$pagename}] consists of 4 parts (if it is a 10 digit ISBN) or 5 parts (for a 13 digit ISBN). The parts of a 10-digit [ISBN] and the corresponding [EAN]‑13 and barcode. Note the different check digits in each. The part of the [EAN]‑13 labeled "[EAN]" is the Bookland country code.
* Prefix element (for a 13-digit ISBN) - a [GS1 Company Prefix]: so far 978 or 979 have been made available by [GS1]
* Registration group element– this identifies the particular country, geographical region, or language area participating in the ISBN system. This element may be between 1 and 5 digits in length
* Registrant element - this identifies the particular publisher or imprint. This may be up to 7 digits in length
* Publication element – this identifies the particular edition and format of a specific title. This may be up to 6 digits in length
* [Check Digit] – this is always the final single digit that mathematically validates the rest of the number. It is calculated using a Modulus 10 system with alternate weights of 1 and 3.


!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [International_Standard_Book_Number|Wikipedia:International_Standard_Book_Number|target='_blank'] - based on information obtained 2017-10-28- 
* [#2] - [What is an ISBN?|https://www.isbn-international.org/content/what-isbn|target='_blank'] - based on information obtained 2018-09-07-